There is a feature to register the data of a client. The user selects a file from his computer, and this file is imported into the server into a separate folder, which can be a PDF , JPEG PNG .
There is an editing screen for this client, where they will have a button to download this document. My question is: How to implement the download functionality of the file stored on the server?
So:
public FileResult Download(int id)
{
var caminhoDaImagem = /* Aqui você usa id que vem por parâmetro pra fazer alguma operação que seleciona o caminho da imagem de algum lugar */
byte[] dadosArquivo = System.IO.File.ReadAllBytes(caminhoDaImagem);
return File(dadosArquivo, System.Net.Mime.MediaTypeNames.Image.Jpeg, "meuarquivo.jpg");
}
See here the MediaTypes for natively available images .
Usage:
http://localhost:porta/MeuController/Download/1
If the file exists on disk and you know its path, it would be better to return it without having to worry about opening it, right?
public FileResult Download(int id)
{
string caminho = /*Buscar caminho do arquivo */;
var result = new FilePathResult(caminho, "image/jpeg")
{
FileDownloadName = "nomeParaDownload.jpg"
};
return result;
}
You should have already seen that the methods of the controllers that meet the requests of the pages return objects of type ActionResult .
Normally you return HTML content through the View method of the controller itself. You can change the return type to a file easily, just return a FileStreamResult object instead of calling the View method.
The official documentation .
And an example:
public ActionResult BoloDeFuba()
{
FileStream arquivo = new FileStream(@"c:\bolo de fubá.doc");
FileStreamResult download = new FileStreamResult(arquivo, "application/msword"); // O segundo parâmetro é o Mime type
download.FileDownloadName = "bolo de fubá.doc";
return download;
}
Note that FileStreamResult receives any object of type Stream . You can mount a file in memory or load it from the database instead of loading from a folder, when you need it or more convenient.